code: def is_env_set(key):
      """
      Checks if an environment variable is set and not "".
      """
      return bool(os.environ.get(key, None))
  
file_path: DeepSpeed/setup.py
imports: import os
  import sys
  import subprocess
  from setuptools import setup, find_packages
  from setuptools.command import egg_info
  import time
  import typing
  from op_builder import get_default_compute_capabilities, OpBuilder
  from op_builder.all_ops import ALL_OPS
  from op_builder.builder import installed_cuda_version
label_desc: Use image node_id 3 for calling a global function with example usage: is_env_set(key) and returns: bool